Special Issue "Development and Applications of Transition Metal or Rare Earth -based Luminescent Inorganic Materials"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Materials".

Deadline for manuscript submissions: 28 February 2020.

Special Issue Editor

Prof. Dr. Enrico Cavalli
E-Mail Website
Guest Editor
Università degli Studi di Parma, Parma, Italy
Interests: luminescence of inorganic solids; pptical spectroscopy; solid state chemistry; crystal growth

Special Issue Information

Dear Colleagues,

The development of new, efficient, and environmentally-friendly technologies constitutes a crucial challenge to this and the next generations of scientists. Among the materials of great present and future perspective of use, inorganic luminescent solids occupy a key place: Lighting, sensing, labelling, photonics, diagnostics, and photocatalysis are only some examples of their fields of application. Research activity is continuously growing together with the demand for materials with ever newer features, suitable for more and more sophisticated applications.

This Special Issue of Crystals is dedicated to all aspects related to the development, characterization, and applications of inorganic luminescent materials containing transition metal or rare earth ions, with the aim to provide an overview of the issues of current interest, without, of course, any claim to completeness and/or exhaustiveness.

Researchers working in the field are invited to contribute. Potential topics of interest include but are not limited to the following:

  • Synthesis and characterization techniques of optical materials;
  • Fundamental photoluminescence properties and spectroscopic measurements;
  • Excited states dynamics: Charge transfer, energy transfer processes, etc.;
  • Thermoluminescence, afterglow;
  • Modeling, first-principles calculations, etc.;
  • Crystals, glasses, amorphous materials, glass ceramics, transparent ceramics;
  • Nanoparticles and nanocomposites;
  • Optical amplifiers, lasers;
  • Phosphors for X-rays, UV, solid-state lighting, displays, imaging;
  • Scintillators;
  • Wavelength converters for efficient photovoltaic systems;
  • Luminescent materials for biological applications;
  • Optical thermometers.

Prof. Dr. Enrico Cavalli
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (3 papers)

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Research

Open AccessArticle
Uniform Spheres of α-NaYF4:RE3+ (RE=Eu, Tb, Ce, Er, and Tm): Template-Free Synthesis, Multi-Color Photoluminescence, and Their Application in Cellular Imaging
Crystals 2020, 10(2), 119; https://doi.org/10.3390/cryst10020119 - 14 Feb 2020
Abstract
Uniformly dispersed luminescent probes with a high brightness and high resolution are desired in bio imaging fields. Here, ~100 nm sized and well-dispersed spheres of RE3+ doped α-NaYF4 (rare earth (RE) = Eu, Tb, Ce, Er, and Tm) have been facile [...] Read more.
Uniformly dispersed luminescent probes with a high brightness and high resolution are desired in bio imaging fields. Here, ~100 nm sized and well-dispersed spheres of RE3+ doped α-NaYF4 (rare earth (RE) = Eu, Tb, Ce, Er, and Tm) have been facile synthesized through hydrothermal processing in the absence of a template, followed by a proper annealing. The processing window of the cubic structured spheres is wide, because the hydrothermal products are independent of the processing conditions, including reaction time and temperature. The original morphology and crystal structure can be well retained with a calcination temperature up to 600 °C. However, calcination gives rise to a reduction of particle sizes, as a result of the crystallite growth and densification. Under ultraviolet radiation, α-NaYF4:RE3+ spheres show characteristic f-f emissions of RE3+ (RE = Eu, Tb, Ce, Er, and Tm), and exhibit orange red, green, ultraviolet (UV), blue green, and blue emissions, respectively. Mainly because of the near-infrared emission at ~697 nm (5D07F4 transitions of Eu3+), the successful imaging of macrophages was achieved by NH2-NaYF4:Eu3+ probes, indicating their excellent imaging capacity for cells in vitro. Full article
Open AccessArticle
Thermoluminescence Characteristics of Terbium Doped Zinc Borates
Crystals 2019, 9(11), 557; https://doi.org/10.3390/cryst9110557 - 25 Oct 2019
Abstract
In this work, structural and thermoluminescence (TL) characteristics for ZnB2O4:xTb3+ (x = 0.01, 0.02, 0.03, 0.04, 0.05, and 0.10 mole) phosphors were investigated. The phosphors were prepared via synthesis of nitric acid. The X-ray diffraction (XRD) studies show [...] Read more.
In this work, structural and thermoluminescence (TL) characteristics for ZnB2O4:xTb3+ (x = 0.01, 0.02, 0.03, 0.04, 0.05, and 0.10 mole) phosphors were investigated. The phosphors were prepared via synthesis of nitric acid. The X-ray diffraction (XRD) studies show that the synthesized samples can be indexed to nearly single-phase cubic ZnB2O4. The TL characteristics following 90Sr beta irradiation (40 mCi) were studied. TL intensity is found to depend on Tb concentration. The optimal concentration of the doped Tb3+ is 0.03 mol in TL measurements. TL dose responses of the phosphors to beta doses of 0.143, 0.715, 1.43, 15, 30 and 60 Gy showed fairly linear behavior. The minimum detectable dose (MDD) value for ZnB2O4:0.04Tb3+ was found to be 87 mGy. The kinetic parameters of the ZnB2O4:0.03Tb3+ sample were estimated by the glow curve deconvolution, the initial rise, the curve fitting, and the peak shape methods. The results indicate that these phosphors are thought to be promising candidates as TL materials. The results provide valuable knowledge of the characteristics of Tb-doped ZnB2O4 for use in dosimetry research. Full article
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Open AccessArticle
Triple-Ringed Luminescent Heptanuclear Zn(II) Cluster for Efficient Ag(I) Ion Sensing Materials
Crystals 2019, 9(7), 374; https://doi.org/10.3390/cryst9070374 - 22 Jul 2019
Abstract
The organic ligands (E)-8-hydroxyquinoline-2-carbaldehyde oxime (H2L1) and furan-2-ylmethanamine (H2L2) were used to react with Zn(NO3)2·6H2O at 140 °C solvothermal for two days to obtain the heptanuclear Zn(II) [...] Read more.
The organic ligands (E)-8-hydroxyquinoline-2-carbaldehyde oxime (H2L1) and furan-2-ylmethanamine (H2L2) were used to react with Zn(NO3)2·6H2O at 140 °C solvothermal for two days to obtain the heptanuclear Zn(II) cluster [Zn7(L1)4(HL1)2(H2L2)(µ2-OH)(µ2-O)(NO3)] (1). The X-ray single crystal diffraction reveals that every five-coordinated Zn(II) ions are surrounded by two N atoms and three O atoms with the N2O3 coordination environment and four-coordinated Zn(II) ion surrounded by one N atom and three O atoms in the NO3 coordinated environment. The photoluminescence of cluster 1 is obvious. Moreover, in the presence of Ag(I) ions, cluster 1 exhibits an efficient recognition ability, and it realizes the recognition of toxic metal ions. Here, we have developed cluster-based sensing materials for the efficient detection of heavy metal ions Ag(I) strategies. Full article
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1. Tentative Title: Luminescence spectroscopy and origin of luminescence centers in Bi - doped materials
Tentative Authors: A. Krasnikov(a), E. Mihokova(b), M. Nikl(b), S. Zazubovich(a) and Ya. Zhydachevskyy(c,d)
affiliations:
a. Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411 Tartu, Estonia
b.
Institute of Physics, Czech AS, Cukrovarnicka 10, 16200 Prague, Czech Republic
c.
Institute of Physics, Polish AS, Al. Lotników 32/46, 02-668 Warsaw, Poland
d. Lviv Polytechnic National University, Bandera 12, 79013 Lviv, Ukraine

Tentative Abstrsct: Luminescence of various Bi - doped materials was systematically investigated starting from 1960’s. Particularly interesting were proved to be Bi3+ - doped complex oxides, where a trivalent Bi3+ ion substitutes for a trivalent rare-earth ion (garnets, oxyorthosilicates, perovskites, borates, phosphates, vanadates, niobates, etc.). These materials became recently the subject of an extensive research due to their possible applications as scintillator and phosphor materials. The oxides co-doped with Bi3+ and trivalent rare-earth ions were proposed as prospective phosphors for white light-emitting diodes as well as quantum cutting down-converting materials applicable for enhancement of silicon solar cells.

2. Tentative Author: Marcos Paulo Belançon
Tentative Abstract: The effects of Cerium incorporation in a Zinc-Tellurite glass containing Sodium and Lanthanum (TZNL) has been investigated. Samples were produced under air atmosphere and thermal, structural and spectroscopic data was acquired. The doped samples exhibited a reddish luminescence under 405 nm excitation, though its origin is attributed to Te4+ ions. Under 450 nm pumping we observed a broadband from 600-750nm in all samples, including the matrix. X-ray diffractograms (XRD) and Fourier transform infrared spectroscopy (FT-IR) analysis confirmed that Cerium is inducing structural changes in the glass and even though Ce$^{3+}$ were not detected directly, its presence is not discarded because the excitation of the Te4+ band observed in the TZNL glass is different from the reported in the literature in such way that Ce3+ may playing some role. An additional excitation/emission study is needed in order to clarify the question.

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